import os

from flask import Flask


def create_app(test_config=None):
    """create and configure the app

    :test_config: TODO
    :returns: TODO

    """
    app = Flask(__name__, instance_relative_config=True)
    app.config.from_mapping(
        SECRET_KEY = 'dev',
        DATABASE = os.path.join(app.instance_path, 'flaskr.sqlite'),
    )

    if test_config is None:
        app.config.from_pyfile('config.py', silent=True)
    else:
        app.config.from_mapping(test_config)

    try:
        os.makedirs(app.instance_path)
    except OSError:
        pass
    from . import db
    from . import auth
    from . import blog

    db.init_app(app)
    app.register_blueprint(auth.bp)
    app.register_blueprint(blog.bp)
    app.add_url_rule('/', endpoint='index')

    @app.route('/hello')
    def hello():
        return 'Hello World!'
    return app


